Logic Input Comparator Circuit for Low-Standby Threshold Detection
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Solution Overview
Problem
Existing logic input processing circuits consume significant power during standby phases and struggle to accurately determine the state of logic inputs with closely defined acceptance thresholds, leading to unnecessary electrical consumption and potential battery discharge.
Innovation Solution
A circuit that utilizes a first comparator to compare the logic input with a reference voltage, with power activation by the logic input itself, and includes a second comparator and switch to control the first reference voltage, ensuring activation only when necessary, using a second reference voltage that is less than the first and set between the minimum high and maximum low input logic levels to avoid noise activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a comparator and reference voltage are continuously powered to process logic inputs, then the logic state determination is reliable, but electrical consumption increases significantly during standby phases
Solution Approach 1:
The circuit employs periodic action by using a second comparator to periodically activate the first reference voltage only when needed. The second comparator monitors the logic input and triggers the first reference voltage activation only when the input exceeds a threshold, converting continuous operation into periodic/conditional operation to reduce power consumption during standby phases while maintaining reliable logic state determination when required
2Measurement precision
If the reference voltage is activated continuously to ensure accurate logic state determination, then measurement precision is maintained, but unnecessary electrical consumption occurs during standby phases
Solution Approach 1:
The circuit extracts the reference voltage activation from continuous operation and separates it into conditional operation. The second comparator and switch mechanism extract only the necessary periods when reference voltage activation is needed, removing the continuous power consumption component while preserving measurement precision during active phases
3Device complexity
If a single comparator is used to process logic inputs, then the device complexity is low, but the circuit cannot effectively manage power consumption during standby phases
Solution Approach 1:
The circuit segments the comparator functionality into two distinct comparators with specialized roles. The second comparator acts as a gatekeeper monitoring logic inputs and activating the first comparator only when necessary. This segmentation allows the system to maintain low complexity while effectively managing standby power consumption through functional division
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The circuit minimizes power consumption during standby phases while precisely determining logic states, even with closely defined thresholds, by activating power sources only when the logic input is present, reducing electrical consumption and battery discharge risks.
Implementation Method 1
a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage
Implementation Method 2
a second comparator capable of comparing the logic input with a second reference voltage and of controlling the switch so as to power the first reference voltage when the logic input is higher than the second reference voltage
Data Source
AI summary
A circuit for processing a logic input, including a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage and otherwise at a second output logic level different from the first output logic level. The power supply of the first comparator and the first voltage reference are activated by the logic input.